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03 what plants need

03 what plants need






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    03 what plants need 03 what plants need Presentation Transcript

    • What Plants Need
      • Nitrogen
      • -Nitrogen is found in the chlorophyll molecule which is important for photosynthesis
      • -nitrogen is also found in proteins
      • -gives plants dark green colour
      • Deficient
      • -plants have yellow leaves and stunted growth
      • Phosphorus
      • -P is found in many molecules (DNA, RNA, ATP, cell membrame)
      • -important in protein synthesis during plant growth
      • Deficiency
      • -plants grow slower
      • -young leaves are grey in colour
      • -older leaves are red in colour
      • Potassium
      • -helps with protein synthesis
      • -important in plant growth
      • -disease resistance
      • -improves quality of plant seeds
      • Deficiency
      • -plants don’t grow
      • -older leaves turn brown and die
      • Magnesium
      • -important for photosynthesis (found in chlorophyll)
      • Deficiency
      • -leaves are yellow with green veins
      • Calcium
      • -develops healthy cell walls
      • Deficiency
      • -unable to grow new leaves, stems and roots
    • Agricultural Revolution
      • -the change in people’s way of life.
      • -the ability to control the growth of plants for food.
    • Nomadic Hunter Gatherers
      • Knowledge: knew which plants were edible, what parts were edible, where they grew and what time of year the plants could be harvested.
      • Tools: for digging edible roots, harvesting seeds and grinding seeds in an edible form.
    • Monoculture
      • One crop is planted
      • Maximizes the amount of food
      • Problems (soil nutrients are depleted)
      • -if the land is used year after year for the same crop, the same minerals will be depleted that the plant needs.
      • -eventually the soil becomes unusable
    • Possible solution
      • Crop Rotation – alternating different plants year after year that require different nutrients to sustain the crop.
      • Eg. Planting legumes one year. How is this beneficial? Think back to grade 10 Ecology.
      • Farm manure
      • Green manure
      • Fertilizers
    • Farm Manure – rich in N, P, K
      • Advantages
      • -manure is natural and easily obtained
      • -manure needs to be disposed of
      • -decomposes and forms humus (increases the soil’s ability to absorb and retain water.
      • -rich in N, P, K
    • Potential Problems
      • Difficult to distribute nutrients evenly
      • Large volume of manure is required (strong smell)
      • High levels of E.Coli (compromise water safety)
      • Need to be stored to avoid nutrient loss from rain
      • Cost of labour
    • Alternative Pest Control Technology
      • Mechanical Control – trapping, catching, picking off unwanted pests.
      • Cultural control – crop rotation
      • Sex attractant control – sterilizing male insects in a lab using radiation. Females mate with sterile males and produce infertile eggs
      • Biological Control – using pests natural enemies to reduce the population. Ladybugs to eat aphids. Marigolds due to their strong smell.